Add metrics for interactions with the Apps Launcher promo dialog.

chrome/browser/ui/webui/ntp/ntp_resource_cache.cc

Index: chrome/browser/ui/webui/ntp/ntp_resource_cache.cc
diff --git a/chrome/browser/ui/webui/ntp/ntp_resource_cache.cc b/chrome/browser/ui/webui/ntp/ntp_resource_cache.cc
index a4753966f315b6cb9a5b3a676d858ecd0902f21d..954984ce6edb4fe44c49eaa20a1db03185b8550c 100644
--- a/chrome/browser/ui/webui/ntp/ntp_resource_cache.cc
+++ b/chrome/browser/ui/webui/ntp/ntp_resource_cache.cc
@@ -8,11 +8,9 @@
 #include <vector>
 
 #include "apps/app_launcher.h"
-#include "apps/field_trial_names.h"
 #include "apps/pref_names.h"
 #include "base/command_line.h"
 #include "base/memory/ref_counted_memory.h"
-#include "base/metrics/field_trial.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_number_conversions.h"
@@ -346,15 +344,8 @@ void NTPResourceCache::CreateNewTabHTML() {
       ThemeServiceFactory::GetForProfile(profile_)->HasCustomImage(
           IDR_THEME_NTP_ATTRIBUTION));
   load_time_data.SetBoolean("showMostvisited", should_show_most_visited_page_);
-  std::string app_launcher_promo_group_name =
-      base::FieldTrialList::FindFullName(apps::kLauncherPromoTrialName);
-  bool show_app_launcher_promo =
-      !apps::IsAppLauncherEnabled() &&
-      local_state->GetBoolean(apps::prefs::kShowAppLauncherPromo) &&
-      (app_launcher_promo_group_name == apps::kShowLauncherPromoOnceGroupName ||
-       app_launcher_promo_group_name ==
-          apps::kResetShowLauncherPromoPrefGroupName);
-  load_time_data.SetBoolean("showAppLauncherPromo", show_app_launcher_promo);
+  load_time_data.SetBoolean("showAppLauncherPromo",
+      apps::ShouldShowAppLauncherPromo());
   load_time_data.SetBoolean("showRecentlyClosed",
       should_show_recently_closed_menu_);
   load_time_data.SetString("title",